void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
{
- const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data;
+ const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data;
+ const uint8_t* FrameData = (const uint8_t*)Data + sizeof(RFCOMM_Header_t);
+ uint16_t FrameDataLen = RFCOMM_GetFrameDataLength(FrameData);
+
+ /* Adjust the frame data pointer to skip over the variable size field */
+ FrameData += (FrameDataLen < 128) ? 1 : 2;
/* Decode the RFCOMM frame type from the header */
switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
{
- case RFCOMM_Frame_SABM:
- RFCOMM_ProcessSABM(FrameHeader, Channel);
- break;
- case RFCOMM_Frame_UA:
- RFCOMM_ProcessUA(FrameHeader, Channel);
- break;
case RFCOMM_Frame_DM:
- RFCOMM_ProcessDM(FrameHeader, Channel);
+ RFCOMM_ProcessDM(&FrameHeader->Address, Channel);
break;
case RFCOMM_Frame_DISC:
- RFCOMM_ProcessDISC(FrameHeader, Channel);
+ RFCOMM_ProcessDISC(&FrameHeader->Address, Channel);
+ break;
+ case RFCOMM_Frame_SABM:
+ RFCOMM_ProcessSABM(&FrameHeader->Address, Channel);
+ break;
+ case RFCOMM_Frame_UA:
+ RFCOMM_ProcessUA(&FrameHeader->Address, Channel);
break;
case RFCOMM_Frame_UIH:
- RFCOMM_ProcessUIH(FrameHeader, Channel);
+ RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, Channel);
break;
default:
- BT_RFCOMM_DEBUG(1, "<< Unknown Frame Type");
+ BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received");
break;
}
}
-static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+{
+ BT_RFCOMM_DEBUG(1, "<< DM Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+}
+
+static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+{
+ BT_RFCOMM_DEBUG(1, "<< DISC Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+
+ // TODO: Close down connection
+
+ BT_RFCOMM_DEBUG(1, ">> UA Sent");
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+}
+
+static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
{
BT_RFCOMM_DEBUG(1, "<< SABM Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
-
- // TODO: Reset channel send/receive state here
-
- struct
- {
- RFCOMM_Header_t FrameHeader;
- uint8_t FrameLength;
- uint8_t FCS;
- } ResponsePacket;
-
- /* Copy over the same frame header as the sent packet to copy the logical RFCOMM channel address */
- ResponsePacket.FrameHeader.Address = FrameHeader->Address;
-
- /* Set the frame type to an Unnumbered Acknowledgement to acknowledge the SABM request */
- ResponsePacket.FrameHeader.Control = RFCOMM_Frame_UA;
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
- /* Set the length to 0 (LSB indicates end of 8-bit length field) */
- ResponsePacket.FrameLength = 0x01;
-
- /* Calculate the frame checksum from all fields except the FCS field itself */
- ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket) - sizeof(ResponsePacket.FCS));
+ // TODO: Reset channel send/receive state
BT_RFCOMM_DEBUG(1, ">> UA Sent");
-
- /* Send the completed response packet to the sender */
- Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel);
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
}
-static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
-
BT_RFCOMM_DEBUG(1, "<< UA Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
}
-static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const uint16_t FrameLength,
+ const uint8_t* FrameData, Bluetooth_Channel_t* const Channel)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ BT_RFCOMM_DEBUG(1, "<< UIH Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+ BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
+
+ if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+ {
+ RFCOMM_ProcessControlCommand((const RFCOMM_Command_t*)FrameData, Channel);
+ return;
+ }
- BT_RFCOMM_DEBUG(1, "<< DM Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ // TODO: Handle regular channel data here
}
-static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ switch (CommandHeader->Command)
+ {
+ case RFCOMM_Control_Test:
+ BT_RFCOMM_DEBUG(1, "<< TEST Command");
+ break;
+ case RFCOMM_Control_FlowControlEnable:
+ BT_RFCOMM_DEBUG(1, "<< FCE Command");
+ break;
+ case RFCOMM_Control_FlowControlDisable:
+ BT_RFCOMM_DEBUG(1, "<< FCD Command");
+ break;
+ case RFCOMM_Control_ModemStatus:
+ BT_RFCOMM_DEBUG(1, "<< MS Command");
+ break;
+ case RFCOMM_Control_RemotePortNegotiation:
+ BT_RFCOMM_DEBUG(1, "<< RPN Command");
+ break;
+ case RFCOMM_Control_RemoteLineStatus:
+ BT_RFCOMM_DEBUG(1, "<< RLS Command");
+ break;
+ case RFCOMM_Control_DLCParameterNegotiation:
+ BT_RFCOMM_DEBUG(1, "<< DPN Command");
+
+ struct
+ {
+ RFCOMM_Command_t Header;
+ RFCOMM_Command_t Command;
+ } Response =
+ {
+ .Header = (RFCOMM_Command_t)
+ {
+ .Command = RFCOMM_Control_NonSupportedCommand,
+ .CR = true,
+ .EA = true,
+ },
+
+ .Command = *CommandHeader,
+ };
- BT_RFCOMM_DEBUG(1, "<< DISC Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(RFCOMM_Command_t), &Response, Channel);
+ break;
+ default:
+ BT_RFCOMM_DEBUG(1, "<< Unknown Command");
+ }
}
-static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, const uint8_t Control, const uint16_t DataLen,
+ const void* Data, Bluetooth_Channel_t* const Channel)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ struct
+ {
+ RFCOMM_Header_t FrameHeader;
+ uint8_t Size[(DataLen < 128) ? 1 : 2];
+ uint8_t Data[DataLen];
+ uint8_t FCS;
+ } ResponsePacket;
+
+ /* Set the frame header values to the specified address and frame type */
+ ResponsePacket.FrameHeader.Control = Control;
+ ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t)
+ {
+ .EA = true,
+ .CR = CommandResponse,
+ .DLCI = DLCI,
+ };
+
+ /* Set the lower 7 bits of the packet length */
+ ResponsePacket.Size[0] = (DataLen << 1);
+
+ /* Terminate the size field if size is 7 bits or lower, otherwise set the upper 8 bits of the length */
+ if (DataLen < 128)
+ ResponsePacket.Size[0] |= 0x01;
+ else
+ ResponsePacket.Size[1] = (DataLen >> 7);
+
+ /* Copy over the packet data from the source buffer to the response packet buffer */
+ memcpy(ResponsePacket.Data, Data, DataLen);
+
+ /* Determine the length of the frame which is to be used to calculate the CRC value */
+ uint8_t CRCLength = sizeof(ResponsePacket.FrameHeader);
- BT_RFCOMM_DEBUG(1, "<< UIH Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH)
+ CRCLength += sizeof(ResponsePacket.Size);
+
+ /* Calculate the frame checksum from the appropriate fields */
+ ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, CRCLength);
+
+ /* Send the completed response packet to the sender */
+ Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel);
}
-static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length)
+static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length)
{
- const uint8_t* CurrPos = FrameStart;
- uint8_t FCS = 0xFF;
+ uint8_t FCS = 0xFF;
- while (Length--)
- FCS = pgm_read_byte(CRC8_Table[FCS ^ *(CurrPos++)]);
+ for (uint8_t i = 0; i < Length; i++)
+ FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]);
return ~FCS;
}
-static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos)
+static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos)
{
- uint8_t FirstOctet = *((*BufferPos)++);
+ uint8_t FirstOctet = BufferPos[0];
uint8_t SecondOctet = 0;
if (!(FirstOctet & 0x01))
- SecondOctet = *((*BufferPos)++);
+ SecondOctet = BufferPos[1];
- return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
+ return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
}
projects / pub / USBasp.git / blobdiff